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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97cb27beb282bd1506d4948e3296e192de73d03abd42d5196927dabac2497c53' 
  AND token = 'zV4the0L/nwU3R+GvVTL0WiXRZG8OU7R5Wow+5ICFpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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