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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b191e1da628c86911632a0e160ea017c0fb8565297ae66d60e668b77aaeab3cd' 
  AND token = '6nVAByI8bg6HWQ0f+JSYDU2zKglQCO60zxfO0bUBX2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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