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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ba898a7b45814ecce1d6593f7ba71e3889ffe6a468a1a0b4e195fb2d75cf5e3' 
  AND token = 'MV8z7cQg7Qg8BmlzQirHL/WdMQdzLFmUke0kkhTCMkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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