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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '848328640cd095dc5c984a6254b5e3fbc1a67d5d1f04c1b10418d9122de27802' 
  AND token = 'X8xxImC7IQHnH1uOMvY//WgRtqSGQtUcUeLLdJi2O08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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