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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '030ac495fd1daff183aebb19ee0a66906d2d0dbcb47500d06374484e07a14499' 
  AND token = 'TQpSqGLCkBkoT1Z7aRVDkfN4Y1MuRP5iOKb2vEgVZL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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