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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c592ba12d3cd2a224fb5d02258a02b0a24f9f9bf27b7e239a40e79af4fad591c' 
  AND token = '8Tf5Aeui/XMJfSMp/fMs7/6e2Lh8d2KIRLmDqRuUX60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}