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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccaaaedbc6dce0fc96bd5380292a52d1f808e5bd09ca6baadc7ecd8038224abe' 
  AND token = '6iMDn033BdvDD3gn6j2gSXhhWJoxrgrKFJUQCdX+KNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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