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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e58c40bae94cb069ecb8fc6ccd18b8f8eceffd300bff9e6b599277241022f78c' 
  AND token = '5h8le2y2Ufz1U3h80iF+3fzDkhgzqRU8WHO3GZ2BIC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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