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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88f61a32fe5abac84ebd4cd07fd68ed42fcf9a5dbfbdbd13ec7388ce84541d9b' 
  AND token = 'czy0Ap310vdmHG+2jtLUOSslU0i7ipYh/E2+pOD0Tos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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