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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f9eb65759a5df0c6058b6c066e0d4d9d54fe903b35e7112cfc0b6b91ed7d94a' 
  AND token = 'JnYcu1cfMqqsfYeDHXRDpo9CI+pzwD/4U0E6ReUgVME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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