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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f404de89141a7a471e898e06ddc42cc1602804a4da2c836d3a6316704a8a39b' 
  AND token = 'p5wYoyBxwtAjaXiHXUzJ2lfM3tevMon/uGVuoxU/NMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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