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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc632144dff377346ee241bceb5e1036814ff3eab89b697f99149e050620256c' 
  AND token = 'CsLOTUhUNb1o8CIAGkol/9p15iv8wgrsAwesbXgOpqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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