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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dcc90599a48c1c56b8a0c71c4b2970b7b6fd74cd89dceeeefd570c8c5cdcf99' 
  AND token = 'nMFve3fYpTO8McSXmPWC7r/z3aAWZJBVa6aS5T96UbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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