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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1caedc97d4792c5af6d71edde8c21f04b74b06391d0d880ab05cb5d4cb2947d' 
  AND token = '580Ohr96uJPAo/3AGWgsf8syLtlE0Fd9BzA0OQp5i88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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