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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3135fc6ad5bffee545d145d289cc06e6fc7f8705e3318d0035b0b18e21de85ee' 
  AND token = 'aywmDQApKbJIxOsp6UAVhY35+eJxblg02ybUltPOpjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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