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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '988facc7e47b3d201ec6bdd0501118e8c96d44b6cb26e4276456090f2df9e34a' 
  AND token = 'aNgXb8PZ7BGwaaVs+41wj083ZAtu5DSKqt2o+ls+l8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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