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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eb3fc806eb375da8cb17af3c6b520ef3d0665308dcd5cb89ae333d2cb89449a' 
  AND token = 'L2fZ7IOyz3tQcjjIRgJpM5puEn1Pg8xxTwR3bswYJeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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