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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aec9256aa2a4be97d3e41363e0cf2bf45105da88365f1aa224abc3ec1553998' 
  AND token = '/hby1WO/rjnHlrwn1ddRrvoQPUnKgNX6H2/UYGngMLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00082

JSON explain

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