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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee14a39af1a74801f9043be460fa97438ebe63864a804557f3e45d7db6321e6e' 
  AND token = 'C0UhoqPSv8y041viN5QvfYC2gu0pqcgaX/PP/FsRe2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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