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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a122870c3e51f0ab65e4ad749eeb120f41e026603a3e35c1e5d7aad41c922488' 
  AND token = 'vq8qTQW7DzkLw3PwymqVDI3J9GPW27ZVm1aD4PWckzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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