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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '476bd3cd9c9eda9055de492bad5ffba3cb9cd0d04ba9a76bec8fd83cec900810' 
  AND token = 'znRCoXEByLE66NI2DNWimqPRIFXnBwaC2ZnbP1UHN2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00089

JSON explain

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