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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bb166864ec429663161c34c2aa468fc5b9f2e70f907b59602084aeca298e8a1' 
  AND token = 'J6hrHi+qj1/2/XHup6fE+kyTeazOJU2Mx5mobjVnGhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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