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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14441feec1f53c6a02bad1c47e2b716550164eedc785d518265bd5212dbfb92a' 
  AND token = '6dEuNT4Qk4wS+l2f8jplRLuO5p7Eb+JwYofy8B8AQUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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