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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '512731769c91c27d23007c912a0a8904e9aab2e9a4d151b78f457d5d6d31bd0e' 
  AND token = '2WA9cr2AR1ut+Uyb4ViH32GF0J813hiLDrtb8x4ALlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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