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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44994cf97ba8e810bc0ceffe9b373a16861b3973f38eb2cf9ec04c359384105b' 
  AND token = 'LTI30mDHO8z/0MYxpQ73dwRa3ZzRiANAaoA6OvqCoQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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