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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fac4d93ae519f0f5ff2db746fa943c489b9ba89f7dc6dcdf57836cc7069a78d' 
  AND token = '84c7D9IQ1kq09ZIrEDdlZECgT3ZP09IVrfQjzZqnFJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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