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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf9b5a572922478e0c3fd837a9545c6d298449af5bf886ddb0cd15b5ec69eafa' 
  AND token = 'KWxN4tu9AvYJp11r3fMJS/p15Y0xOCnUaCZvyEPzR1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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