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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83171b00428169c2f2f9b2d653c9ed7c9daf6cbc2c5db0bb66aac811e0d41ec7' 
  AND token = 'sYjKQlOcNW4u8EN7bmQaT0f1CECHE/I2rOzd71OL+ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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