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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c933dca32e52cde77d72d90faba8c0d872f9e47427a8a2cc97f31f9bbe3836f1' 
  AND token = 'Itx0jAPUmJ6/1Mc8K1TGuXAdYi92rlmtdQ3SpFe0Ykc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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