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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3607d2f19d4d4ae5b26fd66c3193cdcbac7e129ea7ed6159e5738643881e00f4' 
  AND token = 'COaWwXjAXB3QkGrz9z3n6Z3sDjrTGZVl1nWOgV1u71E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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