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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b525b099037bbd75f0a8ee91434fa97f2b21f27f68afc72405a4b0bb0ac79646' 
  AND token = '5EPUJ7rP0SDtOcfApNvHHwyF3Br0CDSu8tU1CR4abbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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