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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf117968c5540a87562ee3e4407a964eca5de6a0b67ebd21e819ad6e8485031d' 
  AND token = '5joyb3mgkNmQ0rzR+wPxj2PXkmEAA77E92EWQDg+8xA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

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