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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0531940c2b688f89594d4ec0f4e40d8401488a7c177ab25c869085644c8bed91' 
  AND token = 'm2zno9xX4L29iNpl/NqKFiYJoJ/xkROir34s1FxgPd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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