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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57008bfbfac2bd0563bbabb1cb4343a5f3c9592ac494354171393b3cd9c2c264' 
  AND token = 'Tt/PWAhzCFkV5/82MpwC0Qx/3mgT1geJwt11l3fKwAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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